Improve handling of <video>, <figure> and <br>

src/com/dom_distiller/client/ContentExtractor.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package com.dom_distiller.client;
 
 import com.google.gwt.dom.client.AnchorElement;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
-import com.google.gwt.dom.client.ImageElement;
 import com.google.gwt.dom.client.Node;
 import com.google.gwt.dom.client.NodeList;
 
 import de.l3s.boilerpipe.BoilerpipeProcessingException;
 import de.l3s.boilerpipe.document.TextBlock;
 import de.l3s.boilerpipe.document.TextDocument;
 import de.l3s.boilerpipe.extractors.CommonExtractors;
 import de.l3s.boilerpipe.labels.DefaultLabels;
 import de.l3s.boilerpipe.sax.BoilerpipeHTMLContentHandler;
 
@@ skipping 45 matching lines @@
             return "";
         }
 
         Node clonedSubtree = NodeListExpander.expand(contentAndRelevantElements).cloneSubtree();
 
         if (clonedSubtree.getNodeType() != Node.ELEMENT_NODE) {
             return "";
         }
 
         // The base URL in the distilled page viewer is different from that in
-        // the live page.  This breaks all relative links (in anchors and
-        // images), so make them absolute in the distilled content.
+        // the live page.  This breaks all relative links (in anchors,
+        // images, etc.), so make them absolute in the distilled content.
         makeAllLinksAbsolute(clonedSubtree);
 
         // TODO(cjhopman): this discards the top element and just returns its children. This might
         // break in some cases.
         return Element.as(clonedSubtree).getInnerHTML();
     }
 
     private static List<Node> getContentNodesForTextDocument(TextDocument document) {
         List<Node> contentTextNodes = new ArrayList<Node>();
         for (TextBlock tb : document.getTextBlocks()) {
@@ skipping 11 matching lines @@
         Element root = Element.as(rootNode);
 
         // AnchorElement.getHref() and ImageElement.getSrc() both return the
         // absolute URI, so simply set them as the respective attributes.
 
         NodeList<Element> allLinks = root.getElementsByTagName("A");
         for (int i = 0; i < allLinks.getLength(); i++) {
             AnchorElement link = AnchorElement.as(allLinks.getItem(i));
             link.setHref(link.getHref());
         }
+        makeAllSrcAttributesAbsolute(root);
+    }
 
-        NodeList<Element> allImages = root.getElementsByTagName("IMG");
-        for (int i = 0; i < allImages.getLength(); i++) {
-            ImageElement image = ImageElement.as(allImages.getItem(i));
-            image.setSrc(image.getSrc());
+    private static native void makeAllSrcAttributesAbsolute(Element root) /*-{
+        var elementsWithSrc = root.querySelectorAll('img,source,track,video');
+        for (var key in elementsWithSrc) {
+            elementsWithSrc[key].src = elementsWithSrc[key].src;
         }
-    }
+    }-*/;
 }